Hinder

Type: Ambush
Source: Dragon #344

Your attack leaves your opponent limping in pain.
Prerequisite: Improved Initiative, skirmish +2d6.
Benefit: By reducing your skirmish damage by one damage die, you can reduce your target's base land speed by up to 10 feet for 1 minute. Multiple attacks made with this feat stack, but you cannot reduce a creature's base land speed below 5 feet. This feat does not affect any other type of movement, such as flying or climbing.
Special: A scout may take Hinder as one of her scout bonus feats.

Feats Finder